Safety device for elevators.



N0. 803,634. PATENTED NOV. '7, 1905. J. W. SMITH, JR. SAFETY DEVICE FORELEVATORS.

APPLICATION FILED APR.25, 1905.

2 SHEETS-SHEET 1.

4 attorney 5 I" 13kbmm No. 803,634. PATENTED NOV. 7, 1905.

J. W. SMITH, JR.

SAFETY DEVICE FOR ELEVATORS.

APPLIOATION FILED APR. 25, 1905.

2 SHEETS-SHEET z.

Elma/14m UNITED STATES PATENT orrron.

JAMES 171 SMITH, JR, OF BODAVILLE, KANSAS, ASSlGNOR OF ONE-HALF TO WM.VVIESE, OF BODAVILLE, KANSAS.

SAFETY DEVICE FOR ELEVATORS.

Specification of Letters Patent.

Patented Nov. '7, 1905.

Application filed April 25, 1905. Serial No. 257,333.

1'0 all whom it may concern.-

Be it known that I, J AMEs W. SMITH, J r., a

citizen of the United States, residing at Bodaville, in the county ofRiley and State of Kansas, have invented certain new and usefulImprovements in Safety Devices for Elevators, of which the following isa specification.

This invention is in line with that class of devices called safetydevices for elevators and designed to increase the safety oftransportation in the ordinary types of passenger elevator-cars atpresent in use.

This invention is applied to the shaft-casing and elevator-car and willprevent opening of the door of the shaft before the elevator-car hascome to a stop; and, further, the practical embodiment of the inventionwill obviate all likelihood of starting of the car before the door hasbeen closed, the above giving rise in many instances to seriousaccidents and loss of life.

For a full description of the invention and the merits thereof and alsoto acquire a knowledge of the details of construction of the means foreffecting the result reference is to be had to the following descriptionand accompanying drawings, in which Figure 1 is a view, partially insection and partially in elevation, showing an elevator shaft brokenaway and the positions of the parts of the safety device comprising thisinvention before the car reaches a landing preparatory to opening thedoor of the shaft. Fig. 2 is a view similar to Fig. 1, showing theposition of the parts after the door has been opened. Fig. 3 is a detailview bringing out more clearly the form of the dog and toothed platewhich cooperates therewith.

Corresponding and like parts are referred to in the followingdescription and indicated in all the views of the drawings by the samereference characters.

Referring to the drawings,the numeral 1 indicates the casing of anelevator-shaft, which may be of any of the various constructions atcasing 1 of the elevator-shaft at one side of the door-opening.

Secured to the elevator-casing 1 at one side of the door-opening inwhich the door 3 is mounted is a lock member 7, consisting of atransversely-slidable lock-plate provided with a longitudinal slot 8,through which a pin or similar fastening 9, secured to the casing 1,passes in order to attach the member 7 thereto. One end of the member 7is adapted to engage over the catch 5 of the door 3, being normally heldin this position by means of a spring 10 bearing against its oppositeend. The spring 10 is interposed between said end of the member 7 andthe adjacent portion of the casing 1. When the lock member 7 is inengagement with the catch 5, it is impossible to open the door 3, sincethe latch means therefor cannot be operated by the conductor of the carfor obvious reasons, the member 7 not being accessible, as it is housedor otherwise attached to the casing 1 and arranged between the car andsaid casing. The car 2, however, is provided with means by which whenthe floor of the car reaches the level of the landing 4 the lock member7will have been operated, so as to be disengaged from the catch 5,permitting the conductor of the car when the latter has stopped todisengage the catch 5 from the catch 6 in opening the door 3. The meanscarried by the car for accomplishing the above consists of a dog 11,fixedly secured to the elevator 2, said dog being provided at one edgewith a plurality of longitudinallyarranged teeth 12 and at its oppositeedge with a cam 13. When the car 2 is going up or down, the cam 13 isadapted to engage a roller 14:, which is carried by the lock member 7 atone end, and the engagement of the parts 13 and 1 1 will force the lockmember 7 out of engagement with the catch 5, as premised upon above. Thecam 13 of the dog 11 engages the roller 14 just as the car reaches alanding either ascending or descending, and when the car is stopped atsuch landing the cam 13 will hold the lock member 7 out of engagementwith the catch 5 against the tension of the spring 10, and as soon asthe dog 11 assumes the position in which the lock member 7 is held fromengagement with the catch 5 the toothed portion of the lock member isautomatically engaged by a toothed member of plate 15. arranged abovethe member 7 and slidable transversely of said casing 1, to

which it is attached. The toothed plate 15 is also held in place uponthe casing 1 by a pinand-slot connection therewith, as shown at 16, andthis toothed plate 15 is secured also to the lower extremity of thedoor-opening lever 17, which is pivotally mounted on the casing 1, asshown at 18. The upper extremity of the lever 17 is provided with alateral extension 19, adapted to be projected from the easing 1, so asto positively engage the adjacent edge portion of the door 3 when thelatter is being forced open by means of the lever 17. A spring 20 isinterposed between a portion of the casing 1 and the lower extremity ofthe lever 17, which carries the plate 15, and the normal tension of thisspring 20 is such that when the door is closed the member 19 of thelever 17 is bearing thereagainst under springpressure of the part 20,cooperating with the lower extremity. The door being closed, the normalposition of the plate 15 is out of the path of movement of the dog 11,carried by the elevator 2.

The functions of the parts hereinbefore described will fully appear inthe statement of the operation of the invention. As the dog 11, eitherin the ascending or descending movement of the car 2, cooperates withthe lock member 7 by engagement of the cam 13 with the roller 14, thesaid lock member 7 Will be forced out of engagement with the catch 5 asthe car stops at the landing 1. The member 7 having been disengaged fromthe member 5, the conductor of the car may readily lift the catch 5, andas soon as this is done the tension of the spring 20, cooperating withthe lever 17, will be sufficient to cause the member 19 to force thedoor open in a manner readily apparent. As the member 19 is forcedtoward the door in opening the same the lower end of the lever 17 isactuated by the spring 20 so as to carry the toothed plate 15 toward thedog 11, which has reached a position just opposite the plate 15 as soonas the car stops. The plate 15, with its teeth in engagement with theteeth 12 of the dog 11, will lock the dog from any movement, so that thecar cannot ascend or descend until the member 15 has been disengagedfrom the member 11. The member 15 will not be disengaged from the member11 until the door has closed again. Said door in its closing movementstriking the extension 19 of the lever 17 and forcing said extensioninwardly throws the plate 15 away from the dog 11, permitting the car tomove when the door 3 is locked closed by the catch 5. The shape of theteeth of the plate 15 and the dog 11, as shown most clearly in Fig. 8,is such as to give the greatest possible interlocking engagement ofthese parts.

Having thus described the invention, what is claimed as new is- 1. In asafety device for elevators, the combination of the shaft-casing, thecar mounted therein, a door, a lock member upon the casing for holdingthe door closed, adog carried by the car for actuating the lock memberaforesaid to permit opening of the door, and means upon the casing forpreventing movement of the dog when the door is open.

2. In a safety device for elevators, the combination of theshaft-casing,the car mounted therein, a door, a lock member upon the easing forholding the door closed, adog carried by the car for actuating the lockmember aforesaid to permit opening of the door, and spring-actuatedmeans upon the casing for preventing movement of the dog when the dooris open.

3. In a safety device for elevators, the com bination of theshaft-casing, the car mounted therein, a door, a lock member upon thecasing for holding the door closed, a dog carried by the car foractuating the lock member aforesaid to permit opening of the door, andmeans governed by the door for preventing movement of the dog when thedoor is open.

4:. In a safety device for elevators, the combination of theshaft-casing, the car mounted therein, a door, a lock member upon theeasing for holding the door closed, a dog carried by the car and havinga cam for actuating the lock member aforesaid to permit opening of thedoor. and means upon the casing for preventing movement of the dog whenthe door is open.

5. In a safety device for elevators, the combination of theshaft-casing, the car mounted therein, a door, a lock member upon thecasing for holding the door closed, a dog carried by the car foractuating the lock member aforesaid to permit opening of the door, adoor-opener, and means carried by the dooropener for preventing movementof the dog after the door is opened.

6. In a safety device for elevators, the combination of theshaft-casing, the car mounted therein, a door, a lock member upon thecas-' ing for holding the door closed, a dog carried by the car foractuating the lock member aforesaid to permit opening of the door, adoor-opener, and a movable plate carried by the door-opener to engagethe dog and prevent movement thereof after the door is opened.

7. In a safety device for elevators, the combination of theshaft-casing, the car mounted therein, a door, a lock member upon thecasing for holding the door closed, a dog carried by the car foractuating the lock member aforesaid to permit opening of the door, adoor-opener comprising a spring-actuated bar arranged to force the dooropen, and means carried by the door-opener for preventing movement ofthe dog after the door is opened.

8. In a safety device for elevators, the com "bination of theshaft-casing, the car mounted therein, a door, a spring-actuated lockmember upon the caslng for holding the door closed, a dog carried by thecar for actuating the lock member aforesaid to permit opening of thedoor, and means upon the casing for preventing movement of the dog whenthe door is open.

9. In a safety device for elevators,.the combination of theshaft-casing, the car mounted therein, a door, a catch for the door, alock member upon the casing and normally engaging said catch to preventoperation thereof, a dog carried by the car and adapted to engage thelock member, and a door-opener cooperating with the dog.

10. In a safety device for elevators, the combination of theshaft-casing, the car mounted therein, a door, a catch for the door, alock member upon the casing and normally engaging said catch to preventoperation thereof, a dog carried by the car and adapted to engage thelock member, a door-opener comprising a pivoted bar arranged to forcethe door open, a spring for actuating said bar, and a toothed slidingmember carried by the bar to engage the dog.

11. In a safety device for elevators, the combination of theshaft-casing, the car movable therein, the door, means for preventingopening of the door except when the car reaches the landing, and anautomatically-operating dooropener for preventing movement of the carwhen the door is open, and permitting movement of the car when the dooris closed.

In testimony whereof I afiix my signature in presence of two witnesses.

JAMES W. SMITH, JR. [n s;]

Vitnesses:

W. D. AUCHARD, GEORGE BEEX.

